Use the system of equations below to solve for z. 6w-4z+2y+8x=52 2y-4w-6x-2z=-28 6z+2x-4w+4y=36 4x+4y-2w-2z=20

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Which statements about the two fossil images are correct? 1. cave bears are ancestors of plateosaurus. 2. plateosaurus were present on earth before ostracoderms. 3. ostracoderms were the first to die. 4. plateosaurus died after the ostracoderms. 5. cave bears are the oldest fossils.

Give 2 examples of the sedimentation in the deep ocean?